MAX6732 MAXIM [Maxim Integrated Products], MAX6732 Datasheet

MAX6732

Manufacturer Part Number

MAX6732

Description

Single-/Dual-/Triple-Voltage ?P Supervisory Circuits with Independent Watchdog Output

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6732.pdf (15 pages)

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Bonase Electronics (HK) Co., Limited

Part Number:

MAX6732UTLTD3+T

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MAXIM

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Bonase Electronics (HK) Co., Limited

Part Number:

MAX6732UTZWD3+T

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The MAX6730–MAX6735 single-/dual-/triple-voltage

microprocessor (µP) supervisors feature a watchdog

timer and manual reset capability. The MAX6730–

MAX6735 offer factory-set reset thresholds for monitor-

ing voltages from +0.9V to +5V and an adjustable reset

input for monitoring voltages down to +0.63V. The com-

bination of these features significantly improves system

reliability and accuracy when compared to separate

ICs or discrete components.

The active-low reset output asserts and remains asserted

for the reset timeout period after all the monitored volt-

ages exceed their respective thresholds. Multiple factory-

set reset threshold combinations reduce the number of

external components required. The MAX6730/MAX6731

monitor a single fixed voltage, the MAX6732/MAX6733

monitor two fixed voltages, and the MAX6734/MAX6735

monitor two fixed voltages and one adjustable voltage. All

devices are offered with six minimum reset timeout peri-

ods ranging from 1.1ms to 1120ms.

The MAX6730–MAX6735 feature a watchdog timer with

an independent watchdog output. The watchdog timer

prevents system lockup during code execution errors.

A watchdog startup delay of 54s after reset asserts

allows system initialization during power-up. The watch-

dog operates in normal mode with a 1.68s delay after

initialization. The MAX6730/MAX6732/MAX6734 provide

an active-low, open-drain watchdog output. The

MAX6731/MAX6733/MAX6735 provide an active-low,

push-pull watchdog output.

Other features include a manual reset input (MAX6730/

MAX6731/MAX6734/MAX6735) and push-pull reset out-

put (MAX6731/MAX6733/MAX6735) or open-drain reset

output (MAX6730/MAX6732/MAX6734). The MAX6730–

MAX6733 are offered in a tiny SOT23-6 package. The

MAX6734/MAX6735 are offered in a space-saving

SOT23-8 package. All devices are fully specified over

the extended -40°C to +85°C temperature range.

19-2629; Rev 5; 3/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

Multivoltage Systems

Telecom/Networking Equipment

Computers/Servers

Portable/Battery-Operated Equipment

Industrial Equipment

Printer/Fax

Set-Top Boxes

Circuits with Independent Watchdog Output

Single-/Dual-/Triple-Voltage µP Supervisory

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ V

♦ Adjustable RSTIN Threshold for Monitoring

♦ Six Reset Timeout Options

♦ Watchdog Timer with Independent Watchdog Output

♦ Manual Reset Input

♦ Guaranteed Reset Valid down to

♦ Push-Pull RESET or Open-Drain RESET Output

♦ Immune to Short V

♦ Low Supply Current: 14μA (typ) at +3.6V

♦ Small 6-Pin and 8-Pin SOT23 Packages

* Insert the threshold level suffixes for V

after “UT” or “KA.” For the MAX6730/MAX6731, insert only the

delay (Table 2) after “D” to complete the part number. For exam-

ple, the MAX6732UTLTD3-T provides a V

+4.625V, a V

out period. Sample stock is generally held on standard versions

only (see the Standard Versions table). Standard versions have

an order increment requirement of 2500 pieces. Nonstandard

versions have an order increment requirement of 10,000 pieces.

Contact factory for availability.

Devices are available in both leaded and lead(Pb)-free/RoHS-

compliant packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

MAX6730UT_D_ -T

MAX6731UT_D_ -T

MAX6732UT_ _D_ -T

MAX6733UT_ _D_ -T

MAX6734KA_ _D_ -T

MAX6735KA_ _D_ -T

from +1.575V to +4.63V

Voltages from +0.79V to +3.08V

Voltages Down to +0.63V (MAX6734/MAX6735 Only)

(MAX6730/MAX6731/MAX6734/MAX6735)

1 threshold suffix after the “UT.” Insert the reset timeout

35s (min) Initial Watchdog Startup Period

1.12s (min) Normal Watchdog Timeout Period

1 (Primary Supply) Reset Threshold Voltages

2 (Secondary Supply) Reset Threshold

1 or V

PART*

2 threshold of +3.075V, and a 210ms reset time-

2 = +0.8V

Ordering Information

-40°C to +85°C

TEMP RANGE

Transients

1 and V

1 threshold of

Features

PIN-PACKAGE

6 SOT23

8 SOT23

2 (Table 1)

Related parts for MAX6732

MAX6732 Summary of contents

Page 1

... Multiple factory- set reset threshold combinations reduce the number of external components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 monitor two fixed voltages and one adjustable voltage. All devices are offered with six minimum reset timeout peri- ods ranging from 1 ...

Page 2

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ABSOLUTE MAXIMUM RATINGS 2, RSTIN, MR, WDI to GND .....................-0. RST, WDO to GND (open drain)...............................-0.3V to +6V RST, WDO to GND (push-pull) .................-0.3V to ...

Page 3

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ELECTRICAL CHARACTERISTICS (continued +0.8V to +5.5V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYM B O ...

Page 4

Page 5

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ( +5V +3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE ( +5V +3.3V ...

Page 6

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ( +5V +3.3V +25°C, unless otherwise noted NORMALIZED TIMEOUT PERIOD vs. TEMPERATURE 1.0040 1.0035 1.0030 1.0025 1.0020 1.0015 1.0010 1.0005 1.0000 0.9995 ...

Page 7

... RSTIN _______________________________________________________________________________________ Active-Low Reset Output. The MAX6730/MAX6732/MAX6734 provide an open- drain output. The MAX6731/MAX6733/MAX6735 provide a push-pull output. asserts low when any of the following conditions occur: V below its preset threshold, RSTIN drops below its reset threshold, or low. Open-drain versions require an external pullup resistor. ...

Page 8

... CC 0.788 respective thresholds and after MR releases high. Whenever V threshold before the end of the reset timeout period, the internal timer restarts. The MAX6730/MAX6732/ MAX6734 provide an open-drain RST output, and the MAX6731/ MAX6733/MAX6735 provide a push-pull RST output. ACTIVE TIMEOUT PERIOD MIN (ms) MAX (ms) 1 ...

Page 9

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Manual Reset Input Many µP-based products require manual reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts the ...

Page 10

... V resistor from RST to GND. The resistor value used is not critical, but it must be large enough not to load the reset output when V most applications, 100kΩ is adequate. Note that this configuration does not work for the open-drain outputs of MAX6730/MAX6732/MAX6734. < t < t < t WD-L WD-S ...

Page 11

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output (MIN) RSTIN t RP RST WDO WDI MR Figure 4. Watchdog Input/Output Timing Diagram (MR and WDO Connected) Applications Information Interfacing to ...

Page 12

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Overdrive, for which reset pulses are not generated. The graph was produced using falling V starting above V and ending below the reset thresh- TH old by the magnitude indicated (reset threshold ...

Page 13

... MAX6731UTTD3-T MAX6731UTSD3-T MAX6731UTRD3-T MAX6731UTZD3-T MAX6731UTVD3-T MAX6732UTLTD3-T MAX6732UTSYD3-T MAX6732UTSVD3-T MAX6732UTRVD3-T MAX6732UTSHD3-T MAX6732UTTGD3-T MAX6732UTSDD3-T MAX6732UTZWD3-T MAX6732UTYHD3-T MAX6732UTZGD3-T MAX6732UTYDD3-T MAX6732UTVHD3-T MAX6732UTWGD3-T MAX6732UTVDD3-T MAX6733UTLTD3-T MAX6733UTSYD3-T MAX6733UTSVD3-T MAX6733UTRVD3-T MAX6733UTSHD3-T MAX6733UTTGD3-T MAX6733UTSDD3-T MAX6733UTZWD3-T MAX6733UTYHD3-T Note: Sample stock is generally held on standard versions only. Standard versions have an order increment requirement of 2500 pieces ...

Page 14

... MAX6730 1 MAX6731 1 MAX6732 2 MAX6733 2 MAX6734 3 MAX6735 3 14 ______________________________________________________________________________________ RST MAX6732 5 WDI GND 2 5 WDI MAX6733 4 MR WDO SOT23-6 ___________________Chip Information TRANSISTOR COUNT: 1073 +1.8V PROCESS: BiCMOS +3. For the latest package outline information and land patterns, go ...

Page 15

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output REVISION REVISION NUMBER DATE 0 10/02 Initial release. 1 12/02 Released MAX6730/MAX6731. 2 1/03 Released MAX6733. 3 3/04 Updated Typical Operating Circuit. 4 12/05 Added lead-free notation to Ordering Information. 5 3/09 ...

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